Paper condenser.



W. LL CASPER.

PAPER GONDBNSER.

APPLIQATION FILED AUG. 2. 191s.

Patented Nov. s, 1914.

/n ven/0r.' @M zie MV \^//777essesx i UNITED STATES PATENT OFFICE.

WILLIAM LEE CASPER, OF BROOKLYN, NEW YORK, ASSIGNOR TO WESTERN ELECTRIC COMPANY, F NEW YORK, N. Y., A CORPORATION OF ILLINOIS.

PAPER CONDENSER.

Specification of Letters Patent.

Patented Nov. 3, 1914.

. ers, of which the following is a full, clear,

vio

concise, ,andv exact description.

This invention relates to condensers and the method of making the same, and its object is to produce a condenser which shall possessl increased efficiency, shall remain permanent in insulation and resistance even though subjected to rough handling, and notwithstanding shall be compact and cheap to manufacture.

The invention broadly consists of condenser units formed of continuous strips of conducting material, such as foil, separated by strips of insulating material, as paper.V

More particularly, the invention relates to means for inclosing the condenser units, whereby they will be retained in their original form and size and will remain sealed from the atmosphere when subjected to rough handling.

Referring now to the drawings-Figure 1 represents a condenser showing the container and the sealing material in cross-section; Fig. 2 is a section on the line 2 2 of Fig. l; and Fig. 3 is a view, similar to Fig. l, of a modified form of condenser,

In accordance with this invention the strips of conducting material and insulating material are first assembled by rolling them together to form a roll. After being rolled the units may be boiled in melted paratlin wax or similar material, subjected to slight pressure on the flat sides thereof, and allowed to cool and set. The unit or units is or are then placed in a container, the space between said container and the unit or units being filled by an insulating material which solidifies at normal atmospheric temperatures, and which is impervious to moisture. This insulating substance is in part at least of such a consistency that it is adapted to cold flow at ordinary temperatures; that is, if a break or crack is made therein by rough handling, it will iow sufficiently to cause it to coalesce or heal the break within'a short time, whereby the unit remains protected from the deteriorating effects of the atmosphere.

This invention relates more particularly to the means for protecting the units from the atmosphere which tends to cause a decrease of insulation therein by carrying moisture to the strips of insulating material. The means of sealing also retains the condensers in their original'form and size, thus maintaining their capacity constant.

The individual units or rolls with which my invention is illustrated may be formed substantially as disclosed in Patent No. 575,653 or in any .desired manner.

Assuming that the individual units have been formed and then impregnated by boiling the same in paraiiin waX or like material, and have been allowed to cool while pressure is-applied to the sides thereof, we will consider the method of assembling the units, wherein resides the principal feature of this invention. After the paralin or other substance has cooled, two of the rolls are secured together by uniting their terminals 2, as shown in Fig'.'l. While in the drawings only one terminal is shown for each roll, it

Y is of course understood that each is provided with two in the usual manner, the terminals being connected in pairs. The two rolls thus joined are then dipped in a molten insulatingA compound, which at ordinary tem er atures is sufficiently solid not to lcold ow. This compound may consist of asphaltum and rosin. I have found a compound consisting of approximately 80% of asphaltic cement, 8% of rosin, and 12% of Montan wax particularly satisfactory. As the quality of different samples of the materials used is not always the same, the exact proportions required ean only be determined by experimenting with samples of the substances to be used. By this dipping process each unit will be entirely surrounded by alayer 3 of the relativelyy hard compound of asphaltum and rosin. The units after cooling are then inserted in a container 4 of tin or other material, the bottom of which has been previously covered to a slight depth by a pouring 5 of a compound impervious to moisture which is of such a consistency that it is adapted to cold iiow or coalesce at normal atmospheric temperatures. This compound may be composed of rosin and rosin-oil united in portions of from 70% rosin and 30% of rosin-oil to 80% of rosin and 20% of rosin-oil, depending upon the quality of the substance used. Care being taken to insure that the unit is same as just described.

evenly spaced from the sides of thecan or container, an additional pouring 6 ofv the last mentioned compound" ismde extend ing above theends of the rolls 1;' `'Elie remaining space at the top of the can may now.. be illedwith a pouring of the harder aud more brittle' compound ,first mentioned, whichi dees te'old flow at ordinary" ten1' peratures. The container" is noiv/v provided with 'a cap or cover 8 through Whichthe terminal clips 7 secured to the. terminals 2'` project.

. The comercial f condenser formedas above, described is of substantially twolmicrofarad capacity.- VIf a condenserlof one-mierofarad isdesired, of course :onlyone roll'fwillbe used, the processoffmanufacturin being otherwise substantiallythe same as Just-described. ff

Eig.; 3 shows a condenser sealed in-'La `slightly different manner,- in that the" dippingV oftherollsin the harder and more brittle compound, prior to inserting tbemin' vthe container, is omitted-f. The method of manufacturing this form is otherwise' the Incondensers as at present manufactured ..it has been found thatf they' deteriorate-very -rapidly both as tocapaeity and insulation resistance, the deterioration in capaeitybeing due' to `a--leosening up .or sepa-rating of the layersaof -conductilg material, and the deterioration in insulation resistance being due to-` the admission of moisture to the',

layers ,of insulation. The containers-or cans are oftentimes ruptured along the seams'by rough handling, and under certain conditions rust' holes soon appear therein- This inventlon, hoWever,1 .rovides means Whereby the condenser 1s e ectively protected net'- vvithstandingany openingswlicl. may be formed in the can andwhich, if the insulat-l ing covering should be cracked', Will ina v very short space of time coalesce so that the slightly, issuiciently Y selidf to maintain the rolls attleworst will be exposedto the de-v4 terioratmg effects of the atmosphere for but.

.a briefspaceof: time. v The sealing 'substance employed, While adapted to cold flow rolls 'in' their original form, thus preventing' a loosenin Qup' o the layers andconsequent ,1..1In a condenser, a unit consisting of f alternate layers of conducting material and insulation, a containerin which said unit is positioned, and a compound of rosin and frsinoiifentiiiely surrounding said unit- Within said container.

2. In a condenser, a unit consisting of alterndte layers oflv conducting material` and insulation',` a container in 'which said unit is positioned,` and'- a' compoundl offrom 70% 5to 80% 'of `rosiland'from 30%*v to 20% or .frosili` oil' snrroindingfsaid unit vvitlin; said container.

3. In' a condenser, a' unit consisting of :alternatev la'yers ofconducting" material and insulatiom: a; container in which said unit is:A positioned, a thin layer of `comparatively. hard' asplaltic compound entirely surroundingsaid unit,- and an' insulating' compound Whiehj will` coles'ce at normal atmospheric temperatures surrounding said-5 layer 'of asphaltic compound. c

m4. In at;condenser,r a` miit consisting of alternate'- iayers of' `cornductin material andv insuleziiionr,r aj cdntfainerinwhich' said unit is positioned,=-,a; thin" layer ,of comparatively hardasplialti'c concpeund-v entirely surround- 5: In a5 condenser, a unit consisting of 'alternate layers` of conducting material-f and insulation;-acontiner in which saidunitis positioned. a* thin layer" or comparatively hard asphalti-c'ompound entirely7 surrounding 'said unitfinda compound ofapproxi- In Witness.Whe'reof,'I hereunto subscribe my name this 30th' day of July D., 1913.

Winntimev CASPER@ 'Witnessesi i I i' "i ELLEN G .MoERe,f-.

Roanne M-SUNTER.

-`ing'said;unitgrand a-compound of rosin and oil? srrouhdingsaid layer of: asphaltic 'cm'noumifv 

